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Code P0420

Tiny
YAZIDAN
  • MEMBER
  • 2004 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 208,000 MILES
The previous owner replaced the catalytic converter last year. What can cause a catalytic converter below threshold? I checked the voltage at idle of the post o2 sensor. It was lean and steady around 0.135 V.
Thank you
Sunday, February 27th, 2022 AT 3:49 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The P0420 code can get triggered due to a bad oxygen sensor, catalytic converter or an exhaust leak.

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

I have attached the trouble shooting guide for the code P0420 below. Take a look at this as it provides a lot of helpful tips on what to look for.

Please let me know if you have any questions.
Thank you.
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Monday, February 28th, 2022 AT 11:32 AM

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